Checker brick



July 22, 1930. c. w. ANDREWS '1,771,242'

. CHECKER BRICK Filed Peb. 18, 1928 2 Sheets-Sheet l July 22,- 1930. c.WANDREws CHECKBR BRICK Filed Feb. 1B, 1928 Patented July 22, 1930 UNITED.STATES PATENT oFFlcyzle:

CHARLES W. ANDREWS, OF CHICAGO, ILLINOIS, ASSIGNOR TO H. A IBIRASSERL 65COM- PANY, OF CHICAGO, ILLINOIS, A. CORORATION F ILLINOIS CHECKER BRICKApplication bfiled February 18, 1928. Serial No. 255,314.

efficiency or transferringr of heat in checkerv brick` and also toincrease the heating sur- 1,, face of a given stove. In stoves of usualconstruction the vertical passageways in the checkerwork are of uniformarea throughout their height and this results in a difference ofvelocity of the gases at different points in the height as the gaseslincrease or decrease in volume during their passage through the ystove. ln the prior application we disclosed .several forms ofconstructions in which `the passage area 'was decreased in the lowerportion of the stove by means of additional loose brick placed in thepassageways. The form previously developed permitted 'the use of loosebrick of varying sizes so that there might be a plurality of zones inthe height of the stove, each Zone having different effective passagearea. The prior construction in- A volved the use of loose brick both inthe passageways formed between the check brick and in verticallyextending passageways formed in the brick themselves.

It is an object of the'present invention to provide a construction inwhich the effective passage area through the checker brick is modifiedby integral portions of the brick.

It is a further object to provide a constructi'on in which a transverseweb extends across the passageway in the brick and in which differentbrick may be made with websof different thickness for use in differentzones in the checker construction.

It is an additional object to provide a construction 1n which integralmeans areV also provided for modifying the area of the passagewaysbetween the brick.

It is also an object to provide a brick which may be readily constructedwith usual brick making machinery ata minimum of cost and which may bereadiy installed in checkerwork construction.

Other and further objects will appear as the description proceeds.

' I have illustrated in the accompanying -drawings certain preferredembodiments of my invention, in which- Flgurel 1s a fragmentarytransverse section through the checker brick embodying my brick;

Figures 2, 3, 4, 5,6, 7 and 8 are views similar to Figure 1 but showingdifferent modified forms of brick.

Referring first to Figure l, the brick 11 are octagonal in crosssection, beingprovided with four sides 12 between which are placed thealternate four sides 13. The sides 12 are materially greater in widththan the sides 13. The brick are built up so that the' sides 13 contactwith adjacent brick and the sides 12 form passageways 14 between thebrick. The brick are provided with vertically rextending passageways 15which are divided by the transverse web 16, shown in section inFigure 1. The side faces of this web are formed by sloping surfaces inangular relation which meet at the thickened central portion 17. -As

the line 21 and these faces are at suchvan the web 16 of the brick 11.As shown in Figure l, the lower loose brick 22 may be thicker than thebrick 19.

The form of construction shown in Fig ure 2 is similar to that in Figure1 except that the passages 23 between the brick 11 have no loose bricktherein. The brick 11 shown in cross section are identical with thebrick 11 of Figure 1. Brick 24, located Y,below the brick 11 are similarin form to the brick 11 lwith the exception that instead of flat faces12, they have rounded faces 25 which extend into the verticallyextending passageways 23. In Figure 3 the brick 11 are shown assuperppsed on brick 26 which .have more pointed projections 27. Theseprojections as shown in the figure, extend further into the passageway28 than do the projections 24 of Figure 2. In Figure 4 the brick 11 aresuperposed'on brick 29 which are formed with extended faces 30 which arecorrugated in form'. These corrugations afford an increased contact areafor the gases passing through the passage- Ways 31. In Figure 2 thebrick 24 have thickened webs 32 which are thicker than the web 1G of thebrick 11. Similarly, in Figure 3, the brick 26 have thickened webs 33and in Figure 4 the brick 29 have thickened webs 34.

The forms of construction shown in Figures 5 to 8 are provided with lugsor extensions which render unnecessary the use of the loose brick whichare used in the form of construction shown in Figure 1.

Referring first to the form of construction shown in Figure 5 the brick36'are formed with eight sides, four wider sides 37 and four narrowersides 38. The narrower sides arcin Contact and the wider sides 37 formthe passage 39 when the brick are built up in a checker workconstruction.

Two of the wider sides 37 are provided with the longitudinally extendingflanges 40. These flanges have the enlarged ends 41 and the reducednecks 42 where the flanges join the main body of the brick. The centralportion of the brick as provided with the openings 43 which areseparated by the web 44. This web 44 is similar in form to the web 16 ofthe form of construct-ion shown in Figure 1. Brick lower in thestructure of Figure 5 are provided with thicker webs 45 similar ingeneral contour to the webs 44. The two openings 43 and the web 44 maybe considered as a cylindrical opening divided by a transverse web. Thebrick are placed in the checker work as shown in Figv ure 5 so that twoflanges 40 will co-operate web 44 may also be provided with widerflanges 46 as shown in the drawing. The form of construction shown 1nFigur 6 is similar to that of Figure 5 with the exception thatall fourof the wider faces 47 of the `block 48 are provided with the flanges 49.These flanges 49 divide the passageways 50 into four smaller passages.Wider flanges 51 may be used in the lowerbrick.

In the vform of construction shown in Figure 7 the brick 52 are providedwith the shorter flanges 53 which are of such length as to divide thepassageway 54 into five substantially equal passage areas. Wider flanges55 may be used on brick in the lower portion of the structure.

The form of construction shown in Figure 8 has the brick 56-providedwith flanges 57 on only two of the wider faces 58. As shown Vin thedrawing, lower brick may be placed at right angles to upper brick sothat the opposed flanges 59 of lower brick form transverse webs at rightangles lo the webs formed by the flanges 57 of the upper brick. .It willbe understood that a number of successive layers of brick may be placedwith their flanges running in the same direction. All of the forms ofconstruction shown in Figures 5 to 8 provide means for progressivelydecreasing the effective area of the passages between the brick, as wellas those extending through the brick, without the use of the loose brickwhich are required in the form of construction shown in Figure 1.

While in each figure of the drawingthere have been but two forms showngiving but two different area of passageways, it rwill be understoodthat the webs, flanges and loose brick may be made in a plurality ofthickmesses. lThe various forms may be used alone or in combination. Forexample, the form Vof brick 26 of Figure 3 might be used forv a lowerchecker section and have superposed thereon the brick 24 of Figure 2 foran intermediate section and the brick 11 of Figure 1 for an upperintermediate section. The brick formed entirely without webs or flangesmay be used in the upper section and such section may have no loosebrick or extensions into the passageways formed between the brick.'

While I have illustrated certain preferred embodiments of my invention.it will be apparent that the invention is capable of furthermodifications with which to meet the varying conditions andreouirements,`and I contemplate such modifications as come within thespirit and scope of the appended claims.

I claim: f

1. A checker brick having a longitudinal opening extending therethroughand an integral web extending transversely of the opening, said webbeing gradually thickened toward its central transverse portion.

2. A checker brick octagonal in form with four alternate faces ofmaterially less width than the remaining four faces and having 'acentral opening therethrough and an integral transverse web in saidopening, said 'web-*having angular surfaces in cross section, beingthicker at its intermediate transverse portion.

3. A checker brick having a longitudinal opening extending therethrou h,an integral web extending transversely o the opening, said web beinggradually thickened toward its central transverse ortion, said brickhav- 'l `ing lateral faces and ongitudinal flanges on certain of saidfaces.

4. A checker brick octagonal in form with four alternate faces ofmaterially less width than the remaining four faces and having a centralopening therethrough, an integral transverse web in said opening, andlongitudinal flanges on the four faces of greater width.

5.l A checker brick octagonal in form with four alternate faces ofmaterially less width than the remaining four faces and having a.central opening therethrough, an integral transverse web in said opemng,said web` having angular surfaces in cross section, being thicker at itsintermediate transverse portion, and longitudinal flanges on the fourfaces of greater width each said flange being similar in contour to onehalf of a transverse web.

6. A checkerwork construction comprising a plurality of octagonal brickbuilt up to form vertically extending passageways therebetween, integralflanges on said brick extending into said passageways, another series ofvertical passageways in said brick and integral webs extendingtransversely of said passageways.

7. A checkerwork construction comprising a plurality of octagonal brickbuilt up to form vertically extending passageways therebetween, integralflanges on said brick extending into said passageways, another series ofvertical passageway/s in said brick and integral webs extendintransversely of said passageways, said we s being similar in contour toa pair of adjacent flanges.

8. A checkerwork construction comprising a plurality of octagonal brickbuilt up to form vertically extending passageways therebetween, integralflanges extendin into all said passageways in the lower portlon of thepassageways in an intermediate section of the structure, verticallyextending passageways in the octagonal brick, thicker integraltransverse webs in the passageways of the brick ,of a lower section ofthe struc ture, and thinner transverse webs in the passageways of thebrick of an intermediate section.

Signed at Chicago, Illinois, this 16th day of February, 1928.

CHARLES W. ANDREWS.

